Mitsubishi Electric MUZ-EF25VG Service Manual page 37

12-4. TROUBLE CRITERION OF MAIN PARTS
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Compressor
Outdoor fan motor
R. V. coil (21S4)
Expansion valve coil
(LEV)
Defrost heater
MUZ-EF•VGH
OBH832
Check method and criterion
Measure the resistance with a tester.
Refer to 12-6. "TEST POINT DIAGRAM AND VOLTAGE", 1. "Inverter
P.C. board", for the chart of thermistor.
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 12-6. "TEST POINT DIAGRAM AND VOLTAGE", 1. "Inverter
P.C. board", for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Temperature: -10 ~ 40°C)
Normal (Ω)
MUZ-EF25/35VG(H) MUZ-EF42/50VG
U-V
U-W 1.59 ~ 2.16
V-W
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
MUZ-EF25/35/42VG
MUZ-EF25/35VGH
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (kΩ)
1.41 ~ 2.00
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Normal (Ω)
MUZ-EF25/35VGH
802 ~ 980
0.82 ~ 1.11
Normal (Ω)
MUZ-EF50VG
32 ~ 43 15 ~ 20
Normal (Ω)
37 ~ 54
37
Figure
WHT
RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)